Question

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1. Define Work. State the conditions that need to be satisfied for work to be
done.
2. When is the work done by a force said to be positive and negative. Give two
examples each.
3. Is work a scalar or vector quantity? Explain.
4. Is it possible that a force is acting on a body but still the work done is zero?
Explain by giving an example.
5. A body is moving along a circular path. How much work is done by the
centripetal force?



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Answer 1

Answer:

1) In physics, work is defined as a force causing the movement—or displacement—of an object.

a) THE APPLIED force should be inclined to the direction of movement.

b) The Applied Force should not be perpendiculer to the direction of movement.

2) Positive work: when force and displacement are in the same direction, the work performed on an object is said to be positive work.

Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.

Negative work: Negative work is performed if the displacement is opposite to the direction of the Force applied.

Example: Work was done the gravity on a rocket going perpendicular upwards

3) Work is a scalar because it is the "dot" product of 2 vectors

4) Yes, it is possible that a force is acting on a body and still the work done is zero. When a man is pushing a wall, work done is zero as there is no displacement.

5) Work done is zero,when the force and the displacement are perpendicular to each other

Hence,the work done by centripetal force is always zero.